The Indomitable Martial King

In a world where humans enslave other races, Archmage Laefenhart is treated as the Demon King by the humans for his sins of helping the other races. A group of heroes came to subdue the Demon King! Laefenhart succeeds in causing great damage to the hero party, but he ends up being in danger of being killed by the Fist King, Tesron… “Space-Time Return Spell.” The magic spell cast as a last resort miraculously succeeds and sends Laefenhart to the past. However… He became one of the heroes: the Fist King, Tesron, who had the strongest body on the continent?! Archmage Laefenhart, with his newly acquired physical strength, changes the world with new powers! (Source: Kakao Entertainment Corp., translated)